/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.tracker.imports.preheat.supplier;

import io.github.classgraph.AnnotationClassRef;
import io.github.classgraph.AnnotationInfo;
import io.github.classgraph.ClassGraph;
import io.github.classgraph.ClassInfo;
import io.github.classgraph.ScanResult;
import java.util.HashMap;
import java.util.Map;
import org.hisp.dhis.tracker.imports.preheat.supplier.strategy.StrategyFor;

/**
 * This class is responsible for creating an associative map where the key is the name of a Strategy
 * class and the key is the name of the domain object class to cache (based on the {@see
 * StrategyFor} annotation)
 *
 * @author Luciano Fiandesio
 */
public class PreheatStrategyScanner {
  public Map<String, String> scanSupplierStrategies() {
    Map<String, String> classMap = new HashMap<>();
    final String pkg = getCurrentPackage();
    final String annotation = StrategyFor.class.getName();
    try (ScanResult scanResult =
        new ClassGraph().enableClassInfo().acceptPackages(pkg).enableAnnotationInfo().scan()) {
      for (ClassInfo classInfo : scanResult.getClassesWithAnnotation(annotation)) {
        classMap.put(getTargetClass(classInfo, annotation), classInfo.getSimpleName());
      }
    }
    return classMap;
  }

  private String getCurrentPackage() {
    return this.getClass().getPackage().getName();
  }

  private String getTargetClass(ClassInfo classInfo, String annotation) {
    AnnotationInfo annotationInfo = classInfo.getAnnotationInfo(annotation);

    AnnotationClassRef klazz =
        (AnnotationClassRef) annotationInfo.getParameterValues().get(0).getValue();

    return klazz.getClassInfo().getSimpleName();
  }
}
